Geir Olav Dahle

1 Introduction Large, sustainable sources of nutritious food are in increasing demand for the expanding world population. The high content of proteins and omega-3 lipids Eicosapentaenoic acid (EPA) and Docosahexaenoic acid (DHA) present in fish and other marine organisms has led to over a third of the worldwide fishing resources being harvested beyond their biologically sustainable levels (FAO 2020), which fuelled the search for alternatives such as fish in the mesopelagic zone.

1 INTRODUCTION In parallel with the continued growth of the human population, ever-greater demands are being placed on the world's resources, including those linked to food and especially protein production. Aquaculture is practised in all regions of the globe and is one of the fastest growing food production sectors, thus potentially filling the gap between food production and global demand (Bostock et al., 2010; Naylor et al., 2021).

LETTER Lars Berg Malvik, Corresponding Author Lars Berg Malvik larsbergmalvik@gmail.com orcid.org/0000-0001-6601-1106 Haukeland University Hospital, Bergen, Norway Drammen Hospital, Drammen, Norway Corresponding Author Lars Berg Malvik, Haukeland University Hospital, Bergen, Norway.